Child Resistant Stove Knob Covers

I originally purchased hinged stove knob covers at a big box store several years ago. Since then I kept going back to the store and buying new ones every few months because the hinges kept breaking and I wanted to keep the stove safe from my kids. At about $20 per set, these were about $5 a piece. After doing some testing, I came to the conclusion that the ones sold at big box store were designed to fail so that you would go buy new ones. Even with mild use, the plastic gets brittle and complete